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Why do lower termites need anal feeding after they molt?
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termite
A termite nest in a tropical rainforest.
Lower termites require anal feeding after they molt because they lose their essential gut protozoans during the molting process.1
These symbiotic flagellate protozoa reside in the termite hindgut and are critical for survival, as they secrete the enzymes necessary to digest cellulose. Because lower termites cannot digest wood without these microorganisms, they must reacquire them from infected, non-molting colony members through anal feeding. This process involves the transfer of hindgut fluid containing the protozoans, a necessity that likely influenced the evolution of termite social structures.1